Drylok, 4 LB, Interior/Exterior Fast Setting Hydraulic Cement, Mixes Easily With Water, Sets In 3-5 Minutes, Stops The Flow Of Water Through Cracks & Holes In Masonry Surfaces, Reduces Radon Gas Penetration, Seals Floor & Wall Joints & Settlement Cracks In Masonry Walls, Anchors Metal To Masonry.